Delay removed event for 60 seconds after the chart's last collected time #12388
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Summary
This PR adds a delay before creating a REMOVED alert event when a chart goes obsolete. It should help with cases when charts go in OBSOLETE and then back to ok quickly.
Test Plan
Similar testing can be conducted as in #12021 (using e.g. a usb stick). This time around, with this PR, the REMOVED event should be produced 60 seconds after the last_collected time.